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Insurance Company Regulatory Requirements - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Dec. 31, 2013
AGM and AGC [Member]    
Statutory Accounting Practices [Line Items]    
Statutory Accounting Practices, Reserves for Contingencies Reassumed $ 428ago_StatutoryAccountingPracticesReservesforContingenciesReassumed
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpandAssuredGuarantyCorpMember
 
New York [Member] | Assured Guaranty (Europe) and Assured Guaranty Municipal Corp. [Member]    
Statutory Accounting Practices [Line Items]    
Contingency reserves reassumed, amount   250ago_StatutoryAccountingPracticesContingencyReservesReassumedAmount
/ dei_LegalEntityAxis
= ago_AssuredGuarantyEuropeandAssuredGuarantyMunicipalCorp.Member
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_NY
New York [Member] | AGM [Member]    
Statutory Accounting Practices [Line Items]    
Threshold for dividend payments as a percentage of policyholder surplus 10.00%ago_StatutoryAccountingPracticesStatutoryThresholdforDividendPaymentsPercentageofPolicyholderSurplus
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_NY
 
Threshold for dividend payments, percentage of adjusted net investment income 100.00%ago_StatutoryAccountingPracticesStatutoryThresholdforDividendPaymentsPercentageofAdjustedNetInvestmentIncome
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_NY
 
Amount available for distribution, current year 221us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_NY
 
Amount available for distribution, next fiscal quarter 40ago_StatutoryAccountingPracticesStatutoryAmountAvailableforDividendPaymentswithoutRegulatoryApprovalAvailableinNextFiscalQuarter
/ dei_LegalEntityAxis
= ago_AssuredGuarantyMunicipalCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_NY
 
MARYLAND | AGC [Member]    
Statutory Accounting Practices [Line Items]    
Threshold for dividend payments as a percentage of policyholder surplus 10.00%ago_StatutoryAccountingPracticesStatutoryThresholdforDividendPaymentsPercentageofPolicyholderSurplus
/ dei_LegalEntityAxis
= ago_AssuredGuarantyCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_MD
 
Threshold for dividend payments, percentage of adjusted net investment income 100.00%ago_StatutoryAccountingPracticesStatutoryThresholdforDividendPaymentsPercentageofAdjustedNetInvestmentIncome
/ dei_LegalEntityAxis
= ago_AssuredGuarantyCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_MD
 
Amount available for distribution, next fiscal quarter 16ago_StatutoryAccountingPracticesStatutoryAmountAvailableforDividendPaymentswithoutRegulatoryApprovalAvailableinNextFiscalQuarter
/ dei_LegalEntityAxis
= ago_AssuredGuarantyCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_MD
 
Reassumed contingency reserves   267ago_StatutoryAccountingPracticesReassumedContingencyReserves
/ dei_LegalEntityAxis
= ago_AssuredGuarantyCorpMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_MD
MARYLAND | AGUS [Member] | AGC [Member]    
Statutory Accounting Practices [Line Items]    
Dividend restrictions on outstanding statutory surplus 90us-gaap_DividendPaymentsRestrictionsScheduleStatutoryCapitalAndSurplus1
/ dei_LegalEntityAxis
= ago_AssuredGuarantyCorpMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ago_AssuredGuarantyUSHoldingIncMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_MD
 
Bermuda [Member] | Assured Guaranty Re [Member]    
Statutory Accounting Practices [Line Items]    
Unencumbered assets 588ago_UnencumberedAsset
/ dei_LegalEntityAxis
= ago_AssuredGuarantyReMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
 
Dividend Payment Restrictions Schedule, Percentage of Statutory Capital 15.00%ago_DividendPaymentRestrictionsSchedulePercentageOfStatutoryCapital
/ dei_LegalEntityAxis
= ago_AssuredGuarantyReMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
 
Statutory surplus 271ago_DividendPaymentsRestrictionsScheduleStatutorySurplus
/ dei_LegalEntityAxis
= ago_AssuredGuarantyReMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
 
Dividend restrictions on outstanding statutory surplus 279us-gaap_DividendPaymentsRestrictionsScheduleStatutoryCapitalAndSurplus1
/ dei_LegalEntityAxis
= ago_AssuredGuarantyReMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
 
Dividend Payment Restrictions Schedule Amount of Statutory Capital $ 127ago_DividendPaymentRestrictionsScheduleAmountOfStatutoryCapital
/ dei_LegalEntityAxis
= ago_AssuredGuarantyReMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM
 
Dividend restrictions on statutory capital and surplus (as a percent) 25.00%ago_DividendPaymentRestrictionsSchedulePercentageOfStatutoryCapitalAndSurplus
/ dei_LegalEntityAxis
= ago_AssuredGuarantyReMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= country_BM